Sabatieria megadena sp. n. (Figs. 1–3, Table 1) Diagnosis. Sabatieria megadena sp. n. is characterised by body length 2290–2890 µm, smooth cuticle without punctations or striations, spiral amphids with 2.0 turns, minute buccal cavity, secretory-excretory system with large and conspicuous renette cell, anterior branch of reproductive system always to the left of intestine and posterior branch always to the right of intestine, and male with arcuate spicules 1.1–1.5 cloacal body diameters long and six tubular precloacal supplements. Etymology. The species name is derived from the Greek megas (=large, great) and adenos (= gland), and refers to the large size of the renette cell in this species. Holotype. Male (NIWA 115450), collected April 2010 (voyage TAN1004, station 22), New Zealand’s Hikurangi Margin, axis of Pahaua Canyon (1188 m water depth), 41.5100°S, 175.7187°E, mean grain size: 11 µm, % silt and clay particles: 96.8%. Paratypes. Two males and six females (NIWA 115451, NNCNZ 3252), same data as holotype. Description. Males. Colourless cylindrical body tapering slightly towards anterior end, with rounded anterior extremity and conicocylindrical tail. Cuticle smooth with sparse somatic setae mainly restricted to pharyngeal region, 2–4 µm long. Two lateroventral rows of 3–4 setae in precloacal region. Six minute inner labial papilla present on lip region; six outer labial papilla in a separate circle and four cephalic setae situated further posteriorly, 0.20–0.25 cbd long. Subcephalic setae absent. Spiral amphideal fovea and aperture, with 2.0 turns, situated immediately posterior to cephalic setae. Buccal cavity minute. Cylindrical pharynx with oval-shaped posterior bulb; pharyngeal tubes present. Nerve ring near middle of pharynx length. Secretory-excretory system present, excretory pore slightly posterior to nerve ring, ampulla large; renette cell large and conspicuous, 24–32 × 55–85 µm, often associated with swelling of body, situated immediately posterior to pharynx. Cardia 15–17 µm long, not surrounded ...